nav{
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 99;
  background-color: #ffffff;
  border-top: 1px solid #3DD689;
}
nav button {
  border: 0;
  float: left;
  width: 50%;
  height: 35px;
  text-decoration: none;
  position: relative;
  overflow: hidden;
  background-color: #FFF;
}

nav button i {
  display: block;
  height: 35px;
  line-height: 35px;
  font-size: 16px;
  color: #000000;
  text-align: center;
}

nav button.clickOn{
  background-color: #3DD689;
}

nav button.clickOn i {
  color: #ffffff;
}
nav em {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #ffffff;
  position: absolute;
  top: 50%;
  left: 50%;
  margin-left: -5px;
  margin-top: -5px;
  opacity: 0;
}
/*nav button.btn-click em{
  -webkit-animation: scale_zoom 1s both infinite;
}

@-webkit-keyframes scale_zoom {
    0%{
        opacity: 0;
        -webkit-transform: scale(0.01);
    }
    99%{
        opacity: 0.7;
        -webkit-transform: scale(20);
    }
    100%{
      opacity: 0;
    }
}*/
